Under normal circumstances, the service station maintenance technician or driver finds the connection of the supercharger pressure shell, or the oil leakage trace at the connection surface between the pressure shell and the middle shell, removes the intake pipeline, and finds traces of organic oil at the outlet of the supercharger, that is, It can be considered that the supercharger leaks oil.
Usually, in many cases, drivers and maintenance workers mistakenly believe that the supercharger is leaking oil. We need to confirm the source of the oil in the first step. The following are common misunderstandings:
1. The supercharger pressure shell, the oil blown from the front end of the intake air, mainly shows the traces of organic oil attached to the intake side and the impeller of the supercharger shell, and these oils may come from the CCV system, or the front side is installed. Equipment that uses oil lubrication and cooling.
2. The oil that is pumped out inside the engine enters the turbine end of the supercharger through the exhaust manifold. It mainly shows obvious carbon deposits on the intake end of the volute connected to the engine exhaust manifold, and even oil and product appear. a mixture of carbon.
3. The supercharger enters the oil pipe flange connection and seeps oil, and the oil flows out to the surface of the supercharger casing.
4. Other engine components leak oil and flow to the surface of the booster housing.
So, we started to check the root cause of the turbocharger oil leak. Before the inspection, we confirm that the engine is in the stop state, and then we check the maintenance history of the engine.
1. Remove the air inlet pipe connected to the pressure shell, check whether the pressure shell of the supercharger and the impeller are rubbed, and whether the impeller is damaged by foreign objects. If so, please replace the supercharger.
2. Gently turn the impeller rotor to see if it is obviously stuck, unable to rotate, or if there is obvious abnormal noise. If so, please replace the supercharger.
3. Use the gap diagnostic tool to check if the axial travel and radial swing of the supercharger are out of tolerance. If it is too poor, please replace the supercharger. For detailed detection methods, please refer to the video "Supercharger Gap Diagnostic Guide".
4. Check for air blockage if it is dirty or damaged.
5. Check the connection line of the air filter to the inlet of the booster shell to see if there is any blockage caused by collapse.
6. Check if there is air leakage in the connecting port between the air inlet of the booster and the intercooler, or if the connecting clamp is loose, if there is air leakage in the intercooler, if any, please retighten or replace the damaged one. Pipe or intercooler.
7. Check if the crankcase pressure is too high, whether the exhaler air duct is blocked, or the sludge is piled up. It is usually possible to diagnose the crankcase pressure too high by measuring the crankcase pressure or the amount of helium.
8. Check if the return line is blocked or if the return gasket blocks the return line.
9. Check if the oil in the oil pan is too high.
If there is no problem with the above checks, please understand whether there are risk factors for oil leakage in the driver's driving habits and driving conditions.
For example, is there a habit of idling for a long time, and the habit of frequently using exhaust brakes. Under normal circumstances, the idle speed exceeds 20 minutes, and the risk of oil leakage from the supercharger is increased. Frequent use of exhaust brakes can cause the supercharger impeller to be vented and cause a pressure differential that can cause oil leakage.